Hm, just one thing, I remember that I got a line said something like "/etc/postfix/main.cf missing, no directory or file", but then it just installed the rest an I could find that file when I checked for it.

This is the difference between the first installation that didn't work and the second that worked:

- ext4 instead of ext3- didn't instal OpenSSH-server/OpenSSH-client before installing iRedMail-0.6.1- As passwords i just used small letters this time and no special characters, e.g. 1st time "Pa55w0rD!", 2st time "password", for MySQL/postmaster/www- Finishing the installation with updated firewall rules but didn't start postfix before deleating iRedMail-0.6.1/config- After deleating iRedMail-0.6.1/config I rebooted the server and then I tried connecting to Roundcube/PostfixAdmin/Awstats and It all worked fine